General form:

DXXXXXXX n+ n- mname <area=val> <m=val> <pj=val> <off>
+   <ic=vd> <temp=val> <dtemp=val>

Examples:

DBRIDGE 2 10 DIODE1
DCLMP 3 7 DMOD AREA=3.0 IC=0.2

The pn junction (diode) implemented in ngspice expands the one found in SPICE3f5. Perimeter effects and high injection level have been introduced into the original model and temperature dependence of some parameters has been added. n+ and n- are the positive and negative nodes, respectively. mname is the model name. Instance parameters may follow, dedicated to only the diode described on the respective line.** area** is the area scale factor, which may scale the saturation current given by the model parameters (and others, see table below). pj is the perimeter scale factor, scaling the sidewall saturation current and its associated capacitance. m is a multiplier of area and perimeter, and** off** indicates an (optional) starting condition on the device for dc analysis. If the area factor is omitted, a value of 1.0 is assumed. The (optional) initial condition specification using ic is intended for use with the uic option on the .tran control line, when a transient analysis is desired starting from other than the quiescent operating point. You should supply the initial voltage across the diode there. The (optional) temp value is the temperature at which this device is to operate, and overrides the temperature specification on the .option control line. The temperature of each instance can be specified as an offset to the circuit temperature with the dtemp option.